Merge branch 'fix-vec-caps-noxsave' of github.com:ldematte/elasticsearch into fix-vec-caps-noxsave

Author: ldematte

docs/changelog/126911.yaml

@@ -0,0 +1,6 @@
+pr: 126911
+summary: Fix `vec_caps` to test for OS support too (on x64)
+area: Vector Search
+type: bug
+issues:
+ - 126809